Excavator flowpoint



UNITED STATES PATENT OFFICE.

EXoAvA'roa rrowroriv'r.

Specification of Letters Patent.

Patented Aug. 8, 1922.

Application filed November 9, 1920. Serial No. 422,806.

To all whom it may concern.-

Be it known that CLAYTON O. ANGLE- MEYER FRANK E. PnRLBnne, both citizens of the United States, and residents of Racine, in the county of Racine and State of Wisconsin, have invented certain new and useful Improvements in Exca vator Plowpoints; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention refers to scraper bucket shoes or plow points, and has for its object to provide a simple, economical and durable shoe wherein the cutting tooth is detachable from the body thereof, for the purpose of renewal or resharpening, it being the practice heretofore to provide teeth or plow points for scraper buckets or scoops in one piece, under which conditions the entire device had to be removed when dulled and a new one substituted therefor.

/Vith the above object in view, the invention consists in certain peculiarities of con struction, and combination of parts as are hereinafter fully set forth with reference to the accompanying illustrations and sub- .sequently claimed.

In the drawings,

Figure 1 represents a sectional elevation of the scraping edge of a scoop, having attached thereto a shoe or plow-point embodying the features of my invention, with parts of said shoe broken away and in section to more clearly illustrate structural features, the section being indicated by line 11 of Figure 2.

Figure 2 is a bottom plan View of the same.

Figure 3 is a detailed end view of the renewable tooth, portion of the shoe looking from the rear, as indicated by the line 33 of Figure 1.

Figure 4 is a plan view of the crown looking downwardly, as indicated by line 4-4 of Figure 1, and I Figure 5 is an end view of the flattened nose portion of the shoe looking toward the rear thereof, showing a dovetailed groove therein for interlocking engagement with the corresponding dove-tailed tongue of the cutting crown.

Referring by characters to the drawings, 1 represents the end portion of a scoop which is thickened slightly at its terminal, and provided with a beveled scraping edge 2. Fitted thereto is a plow-pointer shoe, having a rearwardly extended shank 3, which shank terminates with a forwardly extended head or nose il. The body of the also serves to take up the endwise thrustupon the shoe, as a whole, due to the fact that the bridge 7 is formed with a V-shaped undercut S, which is snugly nested against,

the upper beveled edge of the scoop body. The front end of the nose is flattened obliquely, or from a line approximately the line of a strain, to which the shoe is subjected, when performing its cutting functions as indicated at 9, and said flattened face is interrupted longitudinally by a dove-tailed groove 10, which groove is tapered from the top face of the nose to the lower face, so as to form a wedging locking element.

Fitted to the fiat nose face 9 is a detachable cutting tooth 11. This tooth is V- shaped in elevation and is provided with a rear flat face 12, having extended therefrom a tongue 13, which tongue is of the wedging dove-tailed type and corresponds to the dove-tailed groove 10 formed in the flat face of the nose fl; Hence, when the tooth is adjusted to the nose of the shoe, owing to itsdove-tailed'union therewith, it is firmlyseated and forms a continuation of the nose to provide a chiseled edge cutter.

Owing to the fact that the dove-tailed union is tapered downwardly, in the opposite direction from the line of travel or strain put upon the shoe, there is a constant wedging force tending to cause these parts to be firmly united. Obviously, when the chiseled edge has become worn or broken, it can be removed and sharpened if necessary, or replaced by a new part without the aid of the skilled mechanicor tools. This is an important feature of the invention, due

to the fact that these plow-points "frequently become worn and the excavating or other machinery to which they are attached has to be put out 01 commission until such time as the plow points can be removed. It is manifest that the body of the plow points may be either cast or forged and that the removable cutting tooth can be made of case hardened steel, or other suitable material, difiering in density to the shoe as a whole, whereby expense of manufacture is reduced to a minimum.

lVe claim:

1'. A scraper bucket shoe, having a nose provided with a fiat face and a chiseled edge tooth, having a rear flattened face in dove-tailed union with, the corresponding flattened: face of the shoe nose, the clovetail being tapered in the opposite direction from the cutting strain load put upon the shoe.

2. In a device of the class described, a nose having a dove tail groove therein in combination with a chiseled edge cutting tooth having a dove tailed tongue at its rear end for engagament with the dove tailed groove of said nose, said tongue and said nose being tapered in the opposite direction to the travel of said nose when in operation.

In testimony that we claim/the foregoing we have hereunto set our hands at Racine,

in the county of Racine and State of Wisconsin.

CLAYTON O. ANGLEMEYER. I FRANK E. PERLBERG. 

